ig4 ^ r - Lambert'j Defer iplion of the Blight of IVheai, 



Perfoon, under the name of Uredo, in a work published by him, 

 intitled, Tentamen Difpojitionh Methodica Fungorum, 1797, p. 13. 

 " Pulvere faririaceo, theca orbato, fub foliorum cauliumque epider- 

 mide effufo, hac demum margine lasvi rupta." In page 57, he de^ 

 fcribes different fpecies ; but does not mention that I have obferved,, 

 which I fuppofe to be a new one, and which I fhall call 



Uredo Frumenti, lineari-oblonga fufco-nigricans. 



It is always found on the ftem of the wheat. The Uredo fegetum 

 of Perfoon, var. a Hordei, /3 Tritici, y Avenas, affects only the parts 

 of fructification. 



It is in wet feafons that the wheat is the mod injured by this 

 Fungus, particularly what grows in low ground, as the crops on the 

 hilly country are feldom hurt. I am informed it is only with- 

 in thefe laft twelve or fourteen years that it has been noticed 

 in the Weft of England, or at Jeaft that the wheat has been known 

 to be injured by it; and may it not proceed from the land being too 

 much worked, and not having that reft given it that it requires ? 

 Whether this caufe might have firft brought the difeafe, or whether 

 it might arife from a want of a change of crops, I leave to thofe to 

 determine who are mere in the way of making obfervations upon 

 Agriculture than myfelf. 



See a figure of this Uredo in Sowerby's Fungi, voL 2. tab. 140. 



XVII. Jfm- 



